Malicious PDF — malware analysis report

Static analysis result for SHA-256 68f4242d75a3caf6…

MALICIOUS

PDF

78.7 KB Created: 2021-06-06 16:17:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 38a3d36e2acd125144febef540915775 SHA-1: 3c9564524930ca74933b3c62cc1d94a839d7054a SHA-256: 68f4242d75a3caf69e4403be574e4b370f52022f0f2f043503734681fa30a5aa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically as a phishing or trojan delivery mechanism. It contains a large number of external links, suggesting a link farm or redirection strategy. While no scripts were explicitly extracted, the PDF structure and the presence of external links indicate a potential for malicious content delivery, possibly via embedded JavaScript or by directing users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://wastran.ru/pbw?utm_term=paradise+halls+skyrim+location
    • https://static.s123-cdn-static-d.com/uploads/4460063/normal_60b453b61f7ad.pdf
    • https://cdn-cms.f-static.net/uploads/4462046/normal_5fd645d9866ec.pdf
    • https://kenibuxe.weebly.com/uploads/1/3/4/6/134688639/birofamubuzitul.pdf
    • https://neveloso.weebly.com/uploads/1/3/1/4/131408616/06d301.pdf
    • https://lurenejaxerugu.weebly.com/uploads/1/3/4/7/134728533/nulavugovebeso.pdf
    • https://vuloribogisoso.weebly.com/uploads/1/3/4/6/134655424/8694965.pdf
    • https://betufevu.weebly.com/uploads/1/3/4/0/134098732/zejixav.pdf
    • https://cdn-cms.f-static.net/uploads/4366325/normal_604e3b63b1e54.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/9ff8ff17-ba8b-410a-b931-78cb3fe1972e/7253356074.pdf
    • https://uploads.strikinglycdn.com/files/bbec7d8c-8430-4ca8-a3b1-97c57e4d72cd/samsung_air_conditioner_universal_remote_control_code.pdf
    • https://uploads.strikinglycdn.com/files/bf059379-af33-4e5f-9422-411aff72a99c/jasezosunuzetufitajemoba.pdf
    • http://pajinap.pbworks.com/w/file/fetch/144691137/fujadirekokaguse.pdf
    • https://uploads.strikinglycdn.com/files/436aec25-bfaf-4648-a9df-6ff537230d7c/9497205841.pdf
    • http://tukufidanega.pbworks.com/w/file/fetch/144568509/fisica_vectorial_vallejo_zambrano.pdf
    • https://uploads.strikinglycdn.com/files/85d56904-9843-4925-8916-1fb2866ae511/joxaxopupafariluj.pdf
    • https://uploads.strikinglycdn.com/files/e1bd5ebf-5fc8-4158-9147-53ea77c385ff/elite_platinum_pressure_cooker_by_maxi_matic.pdf
    • https://uploads.strikinglycdn.com/files/16c21d63-a3d2-44d7-ac4b-6d0ddc23b47b/26337983563.pdf
    • https://uploads.strikinglycdn.com/files/c3301e8e-2aee-46a9-adb5-35b30ffddf8f/mopadupamapetitobikigok.pdf
    • http://sepaxebi.pbworks.com/f/what_is_the_best_build_for_firestick_2020.pdf
    • https://uploads.strikinglycdn.com/files/fd43700c-6f4a-4717-a6e8-cdb701ecf7d6/how_many_types_of_assets_and_liabilities.pdf
    • https://uploads.strikinglycdn.com/files/26f53433-0d0b-478d-a5a7-544db9e1d126/bloons_adventure_time_td_cheats.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e94f.bin
07b0542b6703a6f63d0edd95bd9198979fae28bf0aee97eb585c25b5c33b8d43
pdf-font-stream PDF embedded font (sfnt) at offset 0xE94F 5348 bytes
font_01_sfnt_off0000fb58.bin
c2ccf732928728fdef0fd98264266f3fbc8937ee6e29b6ccaadbbaec2716f373
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB58 15512 bytes